Patents by Inventor Bobby L. Craighead

Bobby L. Craighead has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Center column drive arrangement for circular clarifiers
    Patent number: 4048076
    Abstract: A fixed center column supports axially a torque cage mounted to a first bearing on the column, and a second bearing is disposed between the torque cage and a supporting walkway or superstructure. A powered drive unit is mounted to the walkway and has a drive shaft that is connected to the torque cage for rotation thereof about the axis of the center column.
    Type: Grant
    Filed: December 29, 1975
    Date of Patent: September 13, 1977
    Assignee: Environmental Elements Corporation
    Inventors: Stephen G. Pearre, Bobby L. Craighead